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7

The numbers you need are flow rates and desired temperatures. For example, Home Depot's guide gives the following flow rates: Bathroom Faucet: 0.5 – 1.5 gpm Low Flow Kitchen Faucet: 3.0 – 7.0 gpm Shower: 1.0 – 2.0 gpm Dishwasher: 1.0 – 2.5 gpm Clothes Washer: 1.5 – 3.0 gpm Tankless heaters are rated for how much heat they provide at a given flow. If ...


6

With a tankless water heater it's all about how many degrees the heater can raise a certain quantity of water. In your situation, you will need a heater to raise the temperature of about 5 gallons per minute (two showers running at once or one shower and another hot water tap running). If you live in the north, and the water out of the tap is be 40 degrees ...


2

The manual will say something like Flushing the heat exchanger with a descaling solution if mineral build up is evident. Scale build up will shorten the life of the water heater, descale heat exchanger thoroughly and repeat annually depending on mineral content of ground water. (From Bosch 2400E NG user manual) or maybe something like Periodic ...


1

In situations like this, I generally find that the manufacturer is a more reliable source of accurate information than an installer, especially an installer whom you are not using (but then again, you might be wise not to use them, too.) Some installers learned "a particular way" which is either outdated for current equipment or was simply wrong in the first ...


1

Tankless units are limited in the amount of hot water they can produce. It is rated at a certain number of gallons per minute. Think of it in terms of continuous versus multiple use. With a tankless unit rated at 7 gallons per minute you could shower with a 3 gallon per minute shower head until you ran out of fuel. If three people were multiple showering at ...


1

You're adding more points of failure, and when the small tank runs out, you will see a temperature drop until the tank fills with hot water from the reserve. You also have to worry about eventually reselling the home. Given that, my preference is to keep it simple with a single tank. One option to give you the same effect is a single electric tank with the ...



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